Don,
You are correct that historically when the airbus f/o's joined, ( 5 years ago) who are now eligible for command, the airbus side of things was taking longer. A FACT which we all accepted.
You are incorrect though stating that this policy of 15 a/c and boeing transfer will be accepted was in place. No 380's were on property and as such no policy had been instituted.
Was it unwise of the F/O's joining at the time to think that EK would stick to the "continue your career" on the fleet you joined on. I guess so.
We should expect nothing from EK except the path of least expenditure.
Problem is, nobody knows what the whims of that will be when they join.
c'est la vie!!
Regards
I.H